Im just a dreamer : 440 vs 360 magnum

That motorhome 440 has less than 8 to 1 compression as is.

Swapping in the 380 HP will take a few hours and away you go. That 440 will require some parts and time if you want it to really run like a 440 should.

While I am ususally a big block advocate I am going to say 380 HP small block in this situation.

Tom